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Average Speed Formula

The average speed of an object tells you the (average) rate at which it covers distance. Average speed is a measure of the distance traveled in a given period of time; it is sometimes referred to as the distance per time ratio. If a car's average speed is 65 miles per hour, this means that the car's position will change (on the average) by 65 miles each hour. Average speed is a rate. In kinematics, a rate is always a quantity divided by the time taken to get that quantity (the elapsed time). Since average speed is the rate position changes, average speed = distance traveled/time taken.
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Average Speed is given by the formula:

Average Speed Formula

Average speed formula helps you to calculate the average speed for the set of different distances d1, d2..... dn if their corresponding different time intervals t1, t2,....tn are given.

Related Calculators
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Average Speed Problems

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Below are solved examples for average speed:

Solved Examples

Question 1: A car travels a distance of 30 miles for 2 hrs and 45 miles for next 3 hrs. Calculate its average speed.
Solution:
 
Average Speed is given by SAvg = $\frac{Total\ Distance\ Covered}{Total\ time\ taken}$
Total distance traveled Dtotal = 30 miles + 45 miles = 75 miles.
Total time taken t = 2 hr + 3 hr = 5 hr.
SAvg = $\frac{Total\ Distance\ Covered}{Total\ time\ taken}$
        = $\frac{75 miles}{5 hr}$
        = 15 miles/hr.
 

Question 2: Laura is practising for a running race. For 1st $\frac{1}{2}$ hour he runs 0.25 miles and for the next $\frac{1}{2}$ hour she runs for 0.2 miles. Calculate the average speed?
Solution:
 
Average Speed is given by SAvg = $\frac{Total\ Distance\ Covered}{Total\ time\ taken}$
Total distance traveled DTotal = 0.25 miles + 0.20 miles = 0.45 miles.
Total time taken t = $\frac{1}{2}$ hr + $\frac{1}{2}$ hr = 1 hr
SAvg = $\frac{Total\ Distance\ Covered}{Total\ time\ taken}$
        = $\frac{0.45 miles}{1 hr}$
        = 0.45 miles/hr.
 

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